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use std::fmt;
use std::ops::Deref;
use std::str::FromStr;
use crate::helpers::String;
use crate::Error;
use crate::TinyStr16;
/// An ASCII string that is tiny when <= 16 chars and a String otherwise.
///
/// # Examples
///
/// ```
/// use tinystr::TinyStrAuto;
///
/// let s1: TinyStrAuto = "Testing".parse()
/// .expect("Failed to parse.");
///
/// assert_eq!(s1, "Testing");
/// ```
#[derive(Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
pub enum TinyStrAuto {
/// Up to 16 characters stored on the stack.
Tiny(TinyStr16),
/// 17 or more characters stored on the heap.
Heap(String),
}
impl fmt::Display for TinyStrAuto {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.deref().fmt(f)
}
}
impl Deref for TinyStrAuto {
type Target = str;
fn deref(&self) -> &str {
use TinyStrAuto::*;
match self {
Tiny(value) => value.deref(),
Heap(value) => value.deref(),
}
}
}
impl PartialEq<&str> for TinyStrAuto {
fn eq(&self, other: &&str) -> bool {
self.deref() == *other
}
}
impl FromStr for TinyStrAuto {
type Err = Error;
fn from_str(text: &str) -> Result<Self, Self::Err> {
if text.len() <= 16 {
match TinyStr16::from_str(text) {
Ok(result) => Ok(TinyStrAuto::Tiny(result)),
Err(err) => Err(err),
}
} else {
if !text.is_ascii() {
return Err(Error::NonAscii);
}
match String::from_str(text) {
Ok(result) => Ok(TinyStrAuto::Heap(result)),
Err(_) => unreachable!(),
}
}
}
}
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